def getImg(str1):
    list1 = []
    while 1:
        firstSign = str1.find('img src="')
        endSign = str1.find('.jpg')
        if firstSign == -1 or endSign == -1:
            break
        list1.append("https://www.tute.edu.cn/" + str1[firstSign + 15:endSign + 4])
        str1 = str1[endSign + 4:]
    return list1